Need Help with Final Drive lock-up on 49 Cub

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rcupka
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Need Help with Final Drive lock-up on 49 Cub

Postby rcupka » Sun Jan 14, 2018 10:19 pm

Hi Guys,
I have been posting as I get my (new to me) 1949 Cub going.

Last Thursday I got her started and moved her around a few feet to ensure the drive train was working.

Today I started her and took her for a drive. First a half mile in first gear, then a half mile in second gear. When I was in third gear, all of a sudden the right rear wheel locked up solid, just stopped turning.

I put the tractor in reverse and moved a distance and then the right rear wheel locked again. I did some investigation and found that I could move about 7/8 th's of a rotation in forward, and about 7/8th's of a rotation reverse before the wheel locked again. To me it felt like a gear tooth or bolt had broken and was locking up the right wheel.

I was at the end of my lane, about a 1/4 mile from the barn and I was concerned I now had a tractor stuck outside in 14 degree weather that would not move more than a several feet. I was going to leave it there until morning and then decided that since the lane was icy I would go ahead and drive the tractor to my garage with the right rear wheel dragging to get it into a warm area where i could work on it.

As I was moving the tractor, dragging the right rear wheel, all of a sudden it "popped" and began to rotate again. Initially it made a sound and was rough each time a rotation occurred, but by the time I got to the barn, it had smoothed out. I put her way for the night and thought i would seek advice on the forum.

I feel I should take apart the final drive to find out if i broke a gear tooth, bolt etc... Has anyone had this problem before? I feel like it is one step forward , two steps backward lately. On the other hand she started and ran great tonight, so I am still in a positive mood.

Thanks for your input in advance!

Dick Cupka

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Re: Need Help with Final Drive lock-up on 49 Cub

Postby Shane Nelson » Sun Jan 14, 2018 10:23 pm

Start by looking in where the brake rod goes and make sure the brake band is still in tact. After that pull the bottom pan off and see what’s inside of it, i.e. metal chips, bolts, teeth etc. before taking it all the way off.
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Re: Need Help with Final Drive lock-up on 49 Cub

Postby BigBill » Sun Jan 14, 2018 10:31 pm

Ditto on checking out the brake band.
I'm technically misunderstood at times i guess its been this way my whole life so why should it change now.

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Re: Need Help with Final Drive lock-up on 49 Cub

Postby Jim Becker » Sun Jan 14, 2018 11:22 pm

Sounds like the bull gear on that side picked up something between a pair of teeth. On a Cub or A, it is often the back side of a blind drawbar bolt hole from somebody bottoming a bolt then continuing to turn it. Not common on a Cub but some of the larger tractors are known to scoop up a ball from a bearing. On them, it usually wedges between the gear and the housing, punching a hole in the housing.

Pull the pan and see what you can find. Don't just throw the item away, identify it to know what needs fixing.

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Re: Need Help with Final Drive lock-up on 49 Cub

Postby rcupka » Mon Jan 15, 2018 12:01 am

Thank You, I am looking forward to see what caused this, will post the results

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Re: Need Help with Final Drive lock-up on 49 Cub

Postby Bob Triplett » Mon Jan 15, 2018 6:13 am

Might seem a little far fetched, but don't discount ice if you don't find anything else.
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Re: Need Help with Final Drive lock-up on 49 Cub

Postby Urbish » Mon Jan 15, 2018 7:38 am

Let me know if you need in-person assistance as I live and work very close to you.

Also, I noticed in your introductory photos that your tractor has an old gas cap. Many years ago IH started supplying free replacement gas caps due to an issue with the tank pressurizing and burping out fuel when the cap was removed (when the tank was very full). Last time I checked, they are still shipping out free gas caps.

Write down your serial number and head over to http://www.ihgascap.com to get a brand new, free, ventilated gas cap delivered directly to your door.

Jim

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Re: Need Help with Final Drive lock-up on 49 Cub

Postby jsfarmall » Mon Jan 15, 2018 9:53 am

I'm still learning myself.but sounds to me.like something in the differential. That's really easy to check. Drain the transmission fluid and can be saved if need be, take the plate off the back end the pto comes through. It's about 5 to 10 minute job. Need a gasket to go back or I just use permatex liquid gasket. Cheaper and works as good........or better I think. Google it and will show how to get the pto shaft back in. Really easy just a certain way it's gotta be done.

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Re: Need Help with Final Drive lock-up on 49 Cub

Postby Willy » Mon Jan 15, 2018 10:02 am

Urbish wrote:Let me know if you need in-person assistance as I live and work very close to you.

Also, I noticed in your introductory photos that your tractor has an old gas cap. Many years ago IH started supplying free replacement gas caps due to an issue with the tank pressurizing and burping out fuel when the cap was removed (when the tank was very full). Last time I checked, they are still shipping out free gas caps.

Write down your serial number and head over to http://www.ihgascap.com to get a brand new, free, ventilated gas cap delivered directly to your door.

Jim


I got my new type cap from IH a few weeks ago.
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Re: Need Help with Final Drive lock-up on 49 Cub

Postby John *.?-!.* cub owner » Mon Jan 15, 2018 12:12 pm

If I understood right, the wheel would make 7/8 round then lock. reverse and do the same. Since it was only the right wheel it about has to be the bull gear. I have never heard of a cub bull gear braking off a tooth, though that does not mean it cannot happen. There are no bolts inside the final to work out and fall down. The most likely things I can think of are a chunk of ice, which considering the weather is likely, or a bearing coming apart and one of the balls or a piece of the race getting caught in the bull gear teeth. My vote would be for ice though.
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Re: Need Help with Final Drive lock-up on 49 Cub

Postby Crimson Tim » Mon Jan 15, 2018 12:17 pm

That the wheel would turn just a little under one revolution before the wheel locked up each time seems a strong indicator that whatever happened affected the wheel, bull gear or bearings supporting those. Anything farther upstream would factor in the final drive gear ratio, which I don’t remember at the moment. The axle and brake drum will rotate many times per single revolution of the wheel.
For that matter, the bearing races would only make a half revolution per single revolution of the wheel, so that probably rules them out, too, except as the source for the detritus that got into the gear.

It seems the only thing left that makes sense to me it what Jim said: the bull gear picked something up... I’m curious to see what!

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Re: Need Help with Final Drive lock-up on 49 Cub

Postby Frozenstate » Mon Jan 15, 2018 1:52 pm

Grab your wife's blow dryer and heat up the oil pan under the bull gear for a while. It might thaw out. Don't let the wife know.

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Re: Need Help with Final Drive lock-up on 49 Cub

Postby Shane Nelson » Mon Jan 15, 2018 1:58 pm

He went 1/2 a mile in 1st then 1/2 a mile in 2nd before it locked up in 3rd, I don't think it's ice related.
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Re: Need Help with Final Drive lock-up on 49 Cub

Postby rcupka » Mon Jan 15, 2018 2:19 pm

Thank You all for the information, I will gather the new gaskets needed and read about the drive gear setup. I may need to wait for a little warm-up as my barn is not currently heated, but should be able to get to it soon.

I find the ice theory interesting, the tractor sat for 5 years and I did not change the trans or dif lube. There could have been a significat amount of condensation in there. The temps have been below freezing for weeks until we had that warm day on Thursday and when I git it first started it was covered in moisture. I had driven it about a mile before the lock-up, I wonder if a large chunk of ice could have come loose as the tractor warmed up?

I plan to check and drain everything now for signs of metal or teeth before I drive it again.

Jim: Thank you for the kind offer, I will let you know if I get stumped and need help. Also I have a new gas cap for the Cub, saw it mentioned on the forum and had it delivered. even before I got the tractor home. Haven't put it on yet because I just put gas in it last Thursday.


Dick Cupka

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Re: Need Help with Final Drive lock-up on 49 Cub

Postby Matt Kirsch » Wed Jan 17, 2018 9:58 am

It only takes a few minutes to drop the pan on the final drive, 6 or 8 bolts, and it's off. The brake band is kind of hard to get to comparatively speaking.

Make sure you have something under it to catch the oil, but once the pan is off you can inspect for debris, ice, etc..


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